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五十年代末液压挖掘机的出现,逐渐取代了钢索挖掘机,因为液压挖掘机具有下列突出的优点: 1.破碎力和挖掘力较大; 2.装满系数高; 3.装斗速度快;
The emergence of hydraulic excavators in the late 1950s gradually replaced wireline excavators because hydraulic excavators have the following outstanding advantages: 1. Larger crushing forces and greater digging forces 2. High fill factor 3. Fighting speed fast;